I am setting up a remote site to use ISDN as back up link. The primary link will be MPLS, when it goes down the router will connect to the the hub using ISDN.
I have a 1841 router with a 2 port sync/async interface which will connect to an external modem using smart-serial to VTE cable. (5,6 - Blackbox ISU-128 ISDN Modems). The SPIDS will be configured on this external modem.
Mentioned below is the configuration I have come up with. Is there anything else that I need to configure? This is for the remote site but I hope I can just replicate this on the hub as well.
ip address 192.168.251.13 255.255.255.252
no ip mroute-cache
dialer idle-timeout 6000
dialer map ip 192.168.251.14 name Edenton broadcast
no cdp enable
ppp authentication chap
access-list 190 deny ip any host 255.255.255.255
access-list 190 deny eigrp any any
access-list 190 deny tcp any eq 179 any eq 179 --> deny bgp
access-list 190 deny udp any any eq snmp
access-list 190 deny udp any any eq snmptrap
access-list 190 permit ip any any
dialer-list 1 protocol ip list 190
ip route 172.16.0.0 255.255.0.0 192.168.251.14 254 --> floating static
ip route 0.0.0.0 0.0.0.0 192.168.251.14 254 --> floating static